Introduction to MP3 player
MP3 player, as the name suggests, is a music player tool that can play MP3 format.
The compression ratio of an MP3 player can reach 1:12, but there is no distortion to the human ear because it removes sounds beyond the hearing range of the human ear from the digital audio without Change the dominant voice. In addition, MP3 players can also upload and download computer files in any other format. MP3 players have mobile storage functions.
An MP3 player is actually a small computer with specific functions. In the small body of the MP3 player, there are MP3 player memory (memory card), MP3 player display (LCD display), MP3 player central processing unit [MCU (microcontroller) or MP3 player decoding DSP (Digital Signal Processor)] etc.
MP3 player analysis
MP3 player working principle
MP3 player uses digital signal processor DSP (DigitalSignProcesser) to complete the processing, transmission and decoding of MP3 file tasks. DSP is in charge of the Walkman's data transmission, device interface control, file decoding and playback and other activities. DSP can complete a variety of processing tasks in a very short time, and this process consumes very little energy (this is also a significant feature of it being suitable for portable players).
First, take out the MP3 song file from the memory and read the signal on the memory → go to the decoding chip to decode the signal → convert the decoded digital signal into an analog signal through a digital-to-analog converter → then The converted analog audio is amplified → low-pass filtered and then sent to the headphone output port. After output, it is the music we hear.
MP3 internal structure
MP3 player consists of LCD screen (now there is a plush camera without a screen), microprocessor, digital signal processor ( DSP) chip, input and output controller, amplifier and some buttons. The microprocessor is the "brain" of the player, which is used to accept the playback control selected by the user, display the currently playing song information on the LCD screen, and then issue instructions to the data signal processing chip to accurately process the audio signal. . The digital signal processor first uses a decompression algorithm to decompress the MP3 file, then uses a digital-to-analog converter to convert the digital information into waveform information, and then the amplifier amplifies the signal and sends it to the audio port. Finally, we can use the headphones connected to the audio port Hear beautiful music.
History of MP3 players
The world's first MP3 - Saehan MPman F10
The birth of the world's first MP3 actually has a small story The story dates back to one day in March 1997. Mr. Moon, a department manager at Samsung in South Korea, was on a plane returning to Seoul from a business trip in the United States and was reading a report sent to him by his colleague on his laptop. This is a briefing on the synthesis of images, text and MP3 music. When Moon took off his headphones after reading, he found that the passenger next to him was listening to MD. Moon was immediately inspired: If the MP3 music files on the computer could be directly taken out and played on an independent player, wouldn't that be the best way to do this? Good music player? After returning to South Korea, he proposed the idea to then president Yoon Jong-yong. Unfortunately, Samsung was undergoing organizational reorganization at the time and had no time to consider Moon's development proposals. Half a year later, the Asian financial crisis hit Samsung hard, and Mr. Moon was forced to retire early. After leaving Samsung, Mr. Moon joined another Korean company, Saehan, as president, and turned his ideas into reality at Saehan, launching the world's first MP3 player in 1998. MPManF10.
MPMan is derived from the combination of MP3 and WALKMAN. The volume of MPManF10 is 70x90x16.5mm, which is about the size of four 1.44M floppy disks stacked together. It weighs 65 grams, which is very light. MPManF10 does not have any mechanical parts, the signal-to-noise ratio reaches 70dB, and the distortion rate is 0.01-0.1%. During playback, the audio track and playback time can be displayed, the playback sequence can be arranged, it supports bass/midrange amplification, battery status detection and display, and it can maintain 8 hours of playback with 2 nickel-metal hydride batteries. Even now, it does not seem to be lagging behind. . MPManF10 was developed at the time to allow users to download songs from paid music websites. Unfortunately, Saehan did not have enough strength to promote it on a large scale. In addition, MPManF10 used and used flash memory that was extremely expensive at the time. It soon became popular. Lost in the battle with MD.
Although it did not attract much attention, the emergence of MPManF10 has since launched the MP3 market, and many companies in South Korea have begun the research, development and production of MP3. To this day, South Korea still leads the MP3 field.
The most influential MP3-DiamondRioPMP300
After Korea’s MPmanF10 brought surprises to people, the American company Diamond took the lead and launched it at the end of 1998. RioPMP300, this is the first MP3 that impressed the whole world. The biggest advantage of RioPMP300 is that you can download MP3s on the Internet without spending a penny. However, while the rich MP3 resources on the Internet have brought endless surprises and fun, they have also brought new issues of copyright protection. Diamond was soon targeted by the traditional record industry giant RIAA (Recording Industry Association of America), and took Diamond to court on the grounds that RioPMP300 infringed on intellectual property rights.
The matter ended with Diamond winning the lawsuit. The copyright dispute became the biggest publicity for RioPMP300. For a time, RioPMP300 became a well-known "star". It is worth 170 US dollars and is incredibly popular. It became popular all over the world, and people really knew the existence of "MP3 players" at this time. As a result, many people today mistakenly believe that RioPMP300 is the world's first MP3 player.
The first 2.5-inch hard drive MP3 - CreativeNOMADJukebox
In the 21st century, the rapid development of MP3 has made people no longer satisfied with the capacity of flash memory in MB. In January 2000, the big brother in the field of audio hardware innovatively launched the world's first 2.5-inch hard drive MP3 player - NOMAD Jukebox. It uses Fujitsu's 6.4GB 2.5-inch hard drive as the storage medium and can store MP3 files equivalent to more than 100 CDs. The music capacity far exceeded the flash memory MP3 at that time, but the size was also amazing, larger than the average CD Walkman, and its appearance was also very similar to the CD Walkman. Although it uses hard disk media, in order to ensure that music can be played smoothly during exercise, Innovation has designed an 8MB shock-proof cache that can support 5 minutes, so that there will be no music skipping even when going out and moving.
At the same time, NOMADJukebox is also one of the earliest MP3 players with direct recording function. The emergence of the direct recording function allows MP3 to break the limitation of relying on computers to obtain resources. Of course, this freedom of converting CDs to MP3s anytime and anywhere has also attracted the "attention" of the RIAA, but fortunately the innovation originated in Singapore, and the RIAA can only be beyond its reach. Now, direct-recording MP3s have long been popular.
The symbol of MP3 culture - AppleiPod
Super expensive price, exaggerated power consumption and contrary portability, the birth of the innovative NOMAD Jukebox did not replace the hard drive MP3 Really bring it into people’s lives. Until the emergence of Apple iPod... Although the idea of ??using hard disks as MP3 storage media was not first proposed by Apple, iPod is the product that best implements this idea. It was iPod that really started the trend of hard disk MP3!
iPod was born in October 2001. As an MP3 player, it is not outstanding in many aspects: high price, average sound quality, short use time, lack of support for Windows, etc., but it is The first product to bundle Internet music with MP3 player. Many people are willing to pay a small amount of money to download a single song from Apple's official website, or use the unlimited monthly download. iPod really allows record companies to make profits, so it has received support from both consumers and record dealers.
More importantly, apart from the beautiful appearance and humanized creation of the product itself, iPod has become a fashion and a symbol of MP3 music culture. Owning an iPod does not mean that you own the best MP3 player, but it means that you are a person who understands life and has good taste. When something becomes a culture or even a symbol, it will be difficult to replace. This is the biggest reason why iPod has been a best-seller from one generation to the next!
The first MP3 to support WMA encoding - LGMF-PE520
No matter in any field, no one thing will always "dominate". Just as the MP3 music format is becoming increasingly popular on the Internet, more and more digital music formats for the Internet are emerging. Among them, the biggest threats to the MP3 music format are Apple's iTunes and Microsoft's WMA.
WMA is a file format encoded by Windows Media Audio. CDs can be transcribed into WMA format digital music through Windows Media Player. Under the same sound quality, WMA files occupy only half the space of MP3 files, and only need to use a 64Kbps encoding rate, WMA can achieve sound quality close to CD. Supporting WMA music format playback means you can listen to more and better music.
Different from previous encodings, WMA supports the anti-copy function. By adding protection through Windows Media Rights Manager, you can limit the playback time, playback times, and even playback machines, etc. The MP3 music format has not made much progress except for the use of variable encoding rates. Although MP4 and MP3Pro formats later appeared, the lack of support from manufacturers and players made these two formats not popular. Coupled with Microsoft's vigorous promotion of WMA, many people in the industry believe that it is only a matter of time before MP3 is eventually replaced by WMA or other music formats.
In September 2002, the world's first MP3 to support WMA encoding function was born, which is LGMF-PE520. LGMF-PE520 not only supports the playback of WMA music formats, but can also directly transcribe various audio files into WMA format. Compared with other MP3s that only have WMA decoding function, LGMF-PE520 achieves "full support for multiple audio formats."
The first micro hard drive MP3——CreativeNOMADMuVo2
Although hard drive MP3 brings us a large capacity of storage space, it also brings problems such as poor portability and power consumption. Advanced questions. The early hard disk-based MP3 did not pose much of a threat to the traditional flash-based MP3 until the emergence of Creative NOMADMuVo2.
NOMADMuVo2 measures only 67×20×66.5mm, weighs 71g (without battery), uses a one-inch micro hard drive, and has two capacities: 1.5G and 4G. The problems of poor portability and high power consumption caused by hard disk MP3 have been solved one by one by NOMADMuVo2, and its nominal signal-to-noise ratio has reached a record high of 98dB. The characteristics of large capacity, small size and good sound quality are by no means comparable to ordinary flash MP3s. What makes people even more crazy about it is that NOMADMuVo2 has a removable one-inch micro hard drive, and this one-inch micro hard drive itself The value is equivalent to that of NOMADMuVo2, and its excellent price/performance ratio has made NOMADMuVo2 popular in the global market in a short period of time.
The first flash-memory color screen MP3 - Truly MP301
In 2004, when the development of MP3 in terms of capacity, appearance and sound quality could no longer attract more attention, began to Move towards multi-functional development. Just like what happened with mobile phones, people's requirements for MP3 are no longer just to enjoy music, but to be able to play multiple roles like mobile phones.
As the world's first flash-memory color-screen MP3 player, the launch of Truly MP301 has attracted huge attention in the MP3 market. Color screen mobile phones still started with 256 colors, but Truly MP301 got it right in one step, using a 2.2-inch 65,000-color STN screen with a resolution of 160×128 pixels. Although it is not made of TFT material, it has high brightness and high The resolution makes the MP301's picture display effect very delicate, and it still performs well even under strong light, which is better than most color screen mobile phones.
In addition to the color screen, MP301 also supports e-books, picture browsing and game functions. When browsing e-books, pictures or playing games, MP301 can also listen to FM radio or play MP3 music at the same time, allowing you to Your sight and hearing will be pleasurable at the same time!
The first MP3 player that can take pictures - iRiveriFP-1090
Multi-function integration is the development trend of consumer electronics products. After mobile phones are equipped with color screens, cameras follow. The same goes for MP3. The first color screen MP3 actually came from China, which has made major Korean manufacturers very unhappy. This time, South Korea's iRiver seized the opportunity and first launched an MP3 player with a camera - iRiveriFP-1090.
iRiveriFP-1090 follows iRiver’s proud “iron triangle” classic appearance and many revolutionary functional improvements. It has a 1.2-inch 260,000-color LTPS screen and a 300,000-pixel camera. The camera adopts a telescopic It has a stylish design and can be rotated 180° and supports 3x digital zoom. Unfortunately, the photos taken can be directly transmitted to others using the communication network like a mobile phone. In order to cope with the high power consumption caused by the color screen and camera, iRiver equipped the iFP-1090 with a high-capacity built-in lithium battery that can support 36 hours of continuous operation. Although it has a built-in lithium battery, it adopts a detachable design to facilitate users to replace new batteries.
Although the iFP-1090 has been out for a year, the camera has not become popular in MP3, which is far from the development in mobile phones.
The first MP3 to support video playback - DMTECHDM-AV10
I believe many friends have heard of "MP4". The existing term "MP4" is the same as "MP3" "Similarly, it has two meanings: one refers to the MP4 music format, and the other refers to a player that supports video playback. However, the relationship between the two is not different from the relationship between the MP3 music format and MP3 players.
The MP4 music format is a brand new music format. Its compression ratio is higher than the MP3 music format (15:1-20:1), but the sound quality is better than the MP3 music format. More importantly, MP4 music files have built-in copyright descriptions including text, images, etc. related to the copyright holder of the work, and a built-in player, which can be played by double-clicking it in Windows.
Although the MP4 music format is more advanced than the MP3 music format, it cannot compete with the copyright-free MP3 music format. There are very few players that truly support the MP4 music format, and there are almost no players on the market. You can't see it, so the video player generally called "MP4" on the market is not a player that really supports MP4 music format encoding, but a general name for MP3 players that support MPEG-4 file format, also known as Watch for MPEG-4 on the go.
Okay, in order to avoid confusion, hereafter referred to as "MP4" refers to MPEG-4. Products similar to MP4 include PMP (Potable Media Play) and PMC (Potable Media Center), of which PMC is the most common. It uses Microsoft's operating system and is an open product with software upgrade capabilities. By upgrading the software, it can play any The latest file format, and MP4 is completely incomparable.
The world's first player that supports video playback is not PMC, but DM-AV10 from DMTECH of South Korea. It supports MPEG-4SP (Simple Profile), DivX3.11/4.0/5.03/5.1. 1 format file playback, you can also convert WMV, ASF, AVI, MPEG, MPG, VOB, DAT and other file formats into playable video files with the included software, and you can also convert TV, VCD, DVD, DV and other file formats through AV cables. , DC and other real-time images are recorded into high-quality MPEG-4 files.
Overview of CD player
CD player is actually what we often call CD player in daily life. Some people also call it laser record player or laser record player. It is an intelligent high-fidelity stereo equipment controlled by a microcomputer. It uses advanced laser technology, digital technology, computer technology and various new components. It has high-density recording and long playback time (up to 60~75 minutes). ), easy operation, fast song selection and other advantages. It can play back the recorded content realistically, with clear layers and a sense of presence. Its audio technical indicators are very high, with a large dynamic range, a frequency response width of 5~2000Hz, and a distortion as low as 0.003%.
At present, CD players are already very common audio playback equipment. According to their appearance, they can be divided into two types: desktop and portable.
The most famous portable CD players include Sony, Panasonic, etc.
Structure and principle
The CD player is mainly composed of laser pickup and turntable system, servo system, signal processing system, information storage system and control system. The laser pickup is a key component of the CD player. It consists of a semiconductor laser, an optical system and an electrical detector. The laser is a low-power (MW level) AIGAS laser diode. The laser beam emitted is projected onto the information surface of the record through the optical lens system. Since many pits are recorded on the record, when the light point hits the pits, Because the reflected light is weak, the signal picked up by the photoelectric detector is small; when the light spot hits the aluminum film without pits, the reflected light is strong, and the signal picked up by the photoelectric detection is large, which corresponds to the presence or absence of pits. The output of the detector generates corresponding high and low level electrical pulse signals, and then passes through the RF amplifier, and its internal comparator obtains the serial digital signals of "1" and "0", and adds them to the digital signal and processing circuit for demodulation. , frame synchronization signal detection, error correction processing, etc., add the processed data to the digital-to-analog converter (D/A), and convert it into an analog sound signal for output.
Mirror-bright CDs are made of extremely thin aluminum or gold sound membranes with a protective layer of polyvinyl chloride plastic. Like floppy disks and hard disks, CD disks can store information in the form of binary data (data patterns consisting of "0"s and "1s"). To store data on a disc, you must first use a computer to convert the data into binary, and then use a laser to burn the data pattern on a flat, reflective disc. The small pits carved by the laser on the disc represent "1". Blank spaces represent "0". When data is read from a CD, a directed beam of light (laser) moves rapidly across the surface of the disc. A computer or CD player that reads data from a disc looks at every point the laser passes through to determine whether it reflects the laser light. If it doesn't reflect the laser (there's a little crater there), then the computer knows it represents a "1". If the laser light is reflected back, the computer knows that point is a "0." These thousands, or millions, of "l's" and "0's" are then restored into music by a computer or CD player.
The first CD player
In 1982, the world's first CD player and the first CD player produced by Sony was born. It was Sony's CDP -101. Since this player uses binary encoding to record sound, the "101" in the model number is taken from the combination of binary numbers 0 and 1. 101 is 5, which also means that CDP-101 is Sony's mid-level product. The price was $900 at the time.
Main product introduction
Japan, Europe and the United States produce the most car audio hosts and CD players, focusing on the production of power amplifiers and speakers.
(1) The top product of host CD player: Japan NAKAMICHI (Nakamichi)
Its characteristic is that all products are designed with high grade, and the most recommended product is MB- 75, Nakamichi's unique design, integrated six-disc CD player, which can be rotated on the dashboard, allowing multiple CDs to be switched directly from the front, eliminating the need for an additional CD changer in the trunk. It adopts a lifting storage structure and uses limited space as much as possible to accommodate 6 CD records in a DIN host size. It also has AM/FM, handheld wireless remote control, output power of 40W×4, front output 4V, and mute. , bass boost, clock, etc. The production process is exquisite and the performance is stable.
1: Anti-sway suspension system: If the machine tilts within 30 degrees, there is no need to make mechanical adjustments. Its internal sensors automatically sense and make fully automatic adjustments.
2: Magnetic record clamps: Disk clamps are completely different from traditional spring-type shock absorbers. They use springs or similar objects to directly buckle the resistance on the rotating CD. This method greatly reduces the vibration force of the cabinet frame. Transmitted to the disc, affecting the broadcast effect. The clamp of the magnetic record holder is completely isolated from the chassis, preventing internal and external vibrations from entering, resulting in the most accurate and pure signal reading.
3: The stereo shock-absorbing system eliminates the need to install bulky suspension adjusters and absorbs the worst vibrations caused by uneven roads to ensure uninterrupted music playback. 4. Intelligent three-dimensional suspension system prevents sound quality from deteriorating. 5. When the turntable moves in and out of the mechanical part, it does not touch the surface of the CD disk, but only touches the edge of the CD disk to prevent scratches on the CD disk.
(2) Advanced product: Japan ALPINE
It is characterized by BBE technology; BBE is a universal audio technology that improves the clarity of any sound system. BBE was successfully researched and used by Fender guitar developer Leo Fender and BarcusBerry Electronics in California, USA. Now, it has been adopted by many musicians and recording technicians. Now it has been applied to the field of car audio.
How it works:
When you listen to live music, treble and bass are transmitted to the headphones at the same time. However, when the speaker is broadcasting, the voice coil impedance will cause higher frequency sounds to be delayed. This is especially true for transient and intense music (drums, guitar, piano). BEE overcomes this problem by phase compensation (lower frequencies require longer delay times) and adding higher and lower frequencies to compensate for the speaker's lower efficiency in these ranges. This uses a dynamic program drive method to enhance frequency and perform phase compensation.
BBE benefits:
The correct phase relationship of frequencies means that the music is particularly immersive. In other words, it’s like being there in person. The treble is clearer and more detailed, while the bass is richer and more powerful. The tone of each guitar string is more pronounced, further improving clarity. The percussion and picking sounds are audible and exciting, so piano realism is improved. The electronic music is rich and deep, while the vocal music is more powerful and clear.
MaxTuneSQ regulator:
The MaxTuneSQ regulator has the following technical points:
1 The frequency modulation (FM) part adopts a new phase-locked loop with less jitter (PLL) circuit and new low-noise intermediate frequency detection circuit improve the signal-to-noise ratio to 80dB.
2 Uses an improved demodulation coil to reduce distortion (typically 0.01%, but usually less than 0.1%)
3 High-performance ceramic filter with automatic wideband /Narrow mode switching function expands the options, which is particularly important in reception areas with dense signals.
4Improved high power input characteristics.
5 The amplitude modulation (AM) part adopts new parts and circuits to improve the anti-interference performance. The combination of the above technical features enables the regulator to play radio broadcast sounds comparable to CD speakers. With the help of product TDA-7664E.
Digital phase processor:
Using the sound field magician PXA-600, through advanced digital technology, the distance difference (time difference) and reflection of each speaker unit can be correctly adjusted By correcting the sound, the frequency characteristics and phase characteristics, which are important in Hi-Fi playback of car audio, can reach the optimal state. It can not only perform frequency, phase and time accuracy, but also eliminate sound reflections in the low-frequency sound range. Moreover, they are all done by themselves. Therefore, you don't have to worry about complicated installation issues and can enjoy ideal sound and imaging in your car.
(3) PANASONC (Panasonic)
It is characterized by dynamic road noise control: road noise includes engine and wind noise. Recent noise affects the clear and full charge of listening to music. Panasonic CQ -VZ900 type has 4 levels of DRC compensation performance, DRC forms 1 and 2 increase bass and treble respectively, and forms 3 and 4 further enhance quiet music to prevent passenger noise interference. Sound-sensing recording: Built-in meter and storage chip: You can easily note and recall information while driving. This complete solid-state system uses the same type of chip used in mobile phones to record simple things such as names and phone numbers. tips. Representative product CQ-RD595W.
Voice note:
Using this function no longer requires the trouble of preparing paper and pen. Just press the REC (recording) button to record up to 20 seconds of voice, such as If you need to record the broadcast directly, press the MIC/AUDIO button for about 2 seconds to change the microphone to audio input. When microphone input mode is selected, the display will show "MIC". Representative product CQ-R565.
3-DSB (Three-Dimensional Surround Sound)
3-DSB allows you to be excited about wider and more three-dimensional sound reproduction, amplified sound. The front speakers and auxiliary subwoofer, and the deep bass comes from the rear speakers. Using only two front speakers, Spatializera three-dimensional stereo technology can fill the car with music. When the music still stays in the center, it is like a three-dimensional sound stage, instrumental music The speakers surround you, forming this incredible sound change, which requires neither special music signal sources, nor more speakers and equipment, three-dimensional stereo technology, or even German BLAUPUNKT. It is characterized by a security card anti-theft system. Generally, speakers use anti-theft disassembly and assembly of panels and password setting methods, while Delanbao uses computer memory security cards KEYCARD. Functions: 1. Control the radio switch; 2. Record all pre-selected FM (frequency modulation) Radio, LOUDNESSLEVEL, etc. The card design is slim and easy to carry and store. When the car owner removes the card, the special card on the radio will automatically stick out, letting the thief know that the stolen item is useless, greatly reducing the intention of stealing. Two cards are randomly attached to store different records. Representative products include RCM82, etc.
The 10-disc CD that can make phone calls controls 4 units (telephone, CD, radio, tape recorder) all in one TCM127.
The two-in-one car audio and mobile phone saves space. The GMS format is convenient and practical, and the hands-free device increases driving safety. Talk to the caller through a small radio, and the other party's voice will be heard through the speaker without causing any echo. You only need to press a button to check the phone number, and press the blue button to make a call. When there is no SIM card, you can also make emergency calls. 25 phone numbers are stored in the SIM card and 199 numbers are stored in the SIM card. The caller number is displayed and the call charge is calculated. The SIM card can be used as a card lock. Infrared remote control RCT07 and handset TH07 are optional.
(4) KENWOOD (Kenwood)
It is characterized by MASK new secret hiding mechanism: KENWOOD MASK new secret hiding mechanism, with a wide and beautiful front machine control panel and extremely Smooth operating characteristics. The dashboard switch operation can be connected to the ignition key, or can be controlled by the user. When closed, the control panel will disappear from sight to avoid attracting the attention of thieves. The new secret hiding mechanism also has a security code to ensure that the sound system cannot operate if it is stolen. It adopts a new white LED (light-emitting tube) display, which is clear and easy to read no matter day or night, and all information is clear at a glance.
System E'S:
Want to add a subwoofer, but still need to use the radio's built-in power supply? Kenwood developed System E'S, which allows users to reduce the frequency of the subwoofer provided by the full-range speakers. ***8 selectable high-pass filters, allowing users to choose the correct high-pass filter to freely combine different forms and sizes of speakers for use in cars. The new system E'S has gone further in the non-attenuation preset output Improved, with +/-15dB gain or attenuation, allowing users to freely control the volume gain of subwoofer amplification or powered subwoofers. Slide open front operation panel: In order to provide a larger display area, the cassette tape loading port is hidden behind the front control panel. When the OPEN key is pressed, the panel automatically opens. When a tape is inserted, the panel automatically resets, allowing car audio control. It is more convenient. When using the car phone, this function will automatically lower the system sound at high speed. Some speakers will automatically trigger the silencer when a call comes. When the phone is hung up, the speaker will automatically restore the original volume. Representative product KRC-C887R.
VCD viewing function:
Kenwood launches the world's first 1-DINTV/VCD. It provides a 5.8-inch wide-screen TV monitor with touch panel operation, and also includes a built-in VCD player, so you can enjoy movies or other TV programs at will or conveniently. Listen to general music CDs. Representative product VZ907.
SONY (Sony)
It is characterized by a digital synthesized tuner (SSIR-EX): Sony's radio part uses an SSIR-EX tuner, and the traditional tuner has a multi-channel Noise reducer and an independent tuning component, SSIR-EX combines all independent components into one. The SSIR-EXA advanced tuner can automatically control the IF band in FM frequency to reduce interference.
Intelligent operation dial:
It can be used for both volume control and audio signal source selection. The conspicuous and easy-to-see intelligent control dial makes system operation more convenient. The intelligent control dial is set near some important functions such as AMS (Automatic Music Search) keys, so that commonly used function keys can be gathered together and can be easily controlled. In order to enjoy greater operational convenience while driving, you can use the setting button and the intelligent control dial to control a series of system functions. Dynamic Super Bass (D-BASS): The low-frequency bass emitted by car audio is generally easily affected by traffic sounds. covered by the flow. Sony's new dynamic subwoofer system can further express low-frequency bass independently than the traditional bass enhancement system without affecting the mid-range audio. The result is twice as clear and rich low-frequency bass that never drowns out vocals or other musical elements. Sound prompt: Every time you press a function key, the sound prompt will automatically sound for you to confirm the system operation procedure. This brand-new design allows you to concentrate on driving while clearly confirming the system operation status. The representative product is XR-C8220.
Optical fiber transmission (FIBREOPTICS):
The CD changer and host signal transmission uses optical fiber, frequency response 2-20000Hz+/-0.1dB, 1-bit digital-to-analog converter, The distortion rate is 0.001%, the signal-to-noise ratio is 106dB, and it can be used with a radio equipped with a DMS system. CD changer anti-shock system: Car audio is used in sports, and the anti-shock system is the most important. The installation angle of the CD player is 0°-90°, which is very convenient. The super suspension system is mostly used for anti-shock, using tension springs, air bags and driving with TPE The seat sound field simulation system can adjust the sound field emitted by the left/right speakers according to the driver's choice, positioning the sound quality to a perfect level. Self-selected time broadcast system (MYINFORMATION): You can preset the radio stations you want to listen to, so that you can listen to the preset radio broadcasts at the designated time every day. When the set time comes, no matter what state the speaker is working at, It will immediately switch to the preset radio stations, such as news reports, weather forecasts, etc. Representative product CT-X929M.
(5) CLARION
Its characteristic is to create a future of automotive multimedia. Clarion proposed an in-vehicle network concept that integrates the most advanced computer technology with audio, video, and information communications. ClarionSutoPCTM is the first product that turns the in-vehicle network into a product. It is only 1DIN in size, comes with an FM/AM regulator, can control a multi-disc CD changer, and can use DSP to set the half-time mode. The biggest feature of ClarionAutoPCTM is that it only requires additional application software to achieve performance that exceeds that of bus station speakers. It has address recording and simple navigation functions. Operations can be performed using voice. In addition, it also has voice recording function, transmitting or receiving traffic information and electronic mail (E-mail) and other radio data communication functions. ClarionAudoPCTM can also be connected to car alarm systems. If a GPS antenna and TV monitor are attached, it can be upgraded to a navigation device with a map display. It can also exchange address information with a portable computer. ClarionAutoPCTM is not just a car audio, but actually a computer that looks like a car audio.